Effects of canopy manipulation on water use and yield of mangosteen
(Garcinia mangostana L.)
ผลของการจัดการทรงพุ่มที่มีต่อการใช้น้ำและผลผลิตของมังคุด
Nop Sakdiseata, D. of Plant Sci., Rajamangala Inst. of Tech., Tungsong, Nakhon Si Thammarat
Sayan Sdoodee, Assoc. Prof., D. of Plant Sci., F. of Natural Resources, PSU.
Mongkol Lim, Assoc. Prof., D. of Plant Sci., F. of Natural Resources, PSU.
Published : Songklanakarin J Sci Technol 2000, 22(2) : 135-142
Key words : canopy manipulation, water use, yield, mangosteen, Garcinia mangostana L.
The effects of canopy manipulation on water use and yield of mangosteen were studied. An experiment were established as a completely romdomized design in 4 treatments (1. control, 2. prun-ing 50% of inside canopy, 3. pruning 50% of inside canopy and 1.75 m top-cutting and 4. 1.75 m top-cutting) with 4 replications. Sixteen of 22-year-old, uniformly sized mangosteen trees were used.
Water use of the mangosteen trees was determined during 3 stages : 1) fruit setting, 2) fruit develop-ment and 3) fruit ripening. Results showed that significant differences in water use among treatments occurred during the period of fruit-setting and fruit development. During the fruit-setting period, the mangosteen trees in treatment 4 exhibited significantly higher water use (88.96 l d-1) compared to the remaining treatments of control (64.63 l d-1), treatment 2 (60.47 l d-1), and treatment 3 (42.24 l d-1).
In the fruit development period, significantly higher water use was also found in treatment 4 (90.49 l d-1), while there was no significant difference among the treatments of control (64.64 l d-1), treatment 2 (63.90 l d-1) and treatment 3 (45.24 l d-1)
Fruit yields of all treatments were recorded in 1994 and 1995. There was no significant diffe-rence in fruit yield in 1994. In 1995, the highest fruit yield was found in treatment 4 (135.83 kg pt-1) which was significantly higher than those of the control (109.37 kg pt-1), treatment 2 (86.15 kg pt-1)
and treatment 3 (76.07 kg pt-1), respectively. Significant differences in some characters of fruit quality among the treatments were found. It is suggested that canopy manipulation affects water use and yield of mangosteen.
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